The film makes no real sense it has only been constructed to throw together a series of bizarre images the title Xtro, for instance, is a nonsense word and never once used in the film. Director Harry Bromley-Davenport achieves his best with a series of bizarrely incongruous behaviours on the part of Philip Sayer melting a telephone receiver in his hand, eating snake eggs, driving off in a car with a dead body sitting unnoticed in the passenger seat.
Other parts though seem campily laughable like the sequence where a woman is attacked by the alien and wakes up in the morning to find her stomach pregnant and swollen to about the size of a beanbag before it explodes and gives birth to a fully matured Philip Sayer. The sequences with the psychically enlarged Action Man and gleefully prancing clown are daft even on a conceptual level. Other parts are downright bizarre at one point during the manifestations, a panther starts prowling about the house for no discernible reason.
The films low budget is obvious when it comes to the cheap UFO light effects but the makeup jobs for the bizarre alien transmogrifications and the weirdly contorted creature that appears at the beginning are good.
Director/producer Harry Bromley Davenport has gone on to direct a series of Xtro sequels Xtro II: The Second Encounter (1991) and Xtro 3: Watch the Skies (1993). However, none of these have anything to do with the first film (or even one another for that matter). Bromley Davenport has made a handful of other films, including the black comedy Life Among the Cannibals (1996), the childrens film Waking Up Horton/The Adventures of Young Brave (1998) about the returned spirit of an Indian medicine man, Mockingbird Dont Sing (2001), the true story of an adult woman who was treated like an animal, and the ghost story Darkness Visible/Haunted Echoes (2008).